Question

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C problem – division result is always zero

I’m trying to get my head around how objective C works, Can anyone explain what I’m doing wrong?

double hr = ((1/360) * 300);
NSLog(@"%f", hr);

returns:

2012-06-06 14:07:02.511 Clock2[3385:f803] 0.000000

Thanks in advance

Answer 1

C and related languages such as C++ and Objective C use integer (truncating) division when both LHS and RHS are integers, so 1 / 360 = 0. For floating point arithmetic try to get into the habit of using floating point literals, even for whole numbers, i.e. change:

double hr = ((1/360) * 300);

to:

double hr = ((1.0/360.0) * 300.0);